The Temperature Quiz

Play an AI-generated podcast conversation about this lesson

Which of the following is NOT a way in which compensation can work in organisms?

Changing the abundance of an enzyme

Matching enzyme isoform expression to environmental conditions

Changing the temperature of the environment (correct)

Changing enzymes in a pathway

Which of the following statements about isozymes is TRUE?

Isozymes have the same kinetic parameters

Isozymes have the same amino acid sequence

Isozymes catalyze different chemical reactions

Isozymes allow fine-tuning of metabolism (correct)

In which organism does compensation occur by increasing the amount of enzyme to compensate for reduced efficiency at lower temperature?

Antarctic icefish (correct)

Butter

Rainbow Trout

Olive Oil

What happens to the affinity of acetylcholinesterase for acetylcholine in the Antarctic icefish?

Affinity decreases Signup and view all the answers

In the Rainbow Trout, at what temperature is there full compensation?

18°C Signup and view all the answers

What contributes to compensation in organisms through changes in an enzyme's microenvironment?

All of the above Signup and view all the answers

Which of the following changes in the phospholipid membrane increases fluidity?

Incorporating double bonds Signup and view all the answers

What does behavioural thermoregulation in lizards involve?

All of the above Signup and view all the answers

What does behavioural thermoregulation in drought-stressed corn involve?

Reducing sun interception Signup and view all the answers

Are ectotherms passive victims of their thermal environments?

No Signup and view all the answers

Which equation represents the relationship between metabolic rate (M), body temperature (Tb), and constants (a and n) for an ectotherm?

$M = a10^nTb$ Signup and view all the answers

What is the intercept in the equation $logM = log(a) + nTb$?

$log(a)$ Signup and view all the answers

What does Q10 represent in the equation $Q10 = \frac{RT}{R(T-10)}$?

The temperature coefficient Signup and view all the answers

Which statement about the temperature-metabolic rate relationship is true?

The relationship is not exactly exponential Signup and view all the answers

What is the function of enzymes in facilitating chemical reactions?

Enzymes bind substrates and facilitate chemical reactions Signup and view all the answers

What does Km represent in the reaction rate equation $Vmax = \frac{Vmax}{2} + Km$?

The amount of substrate required to reach 50% of Vmax Signup and view all the answers

How does enzyme-substrate affinity change with temperature?

Affinity can be too high or too low at extreme temperatures Signup and view all the answers

What is the term for a genetically controlled trait that confers a greater probability of survival and successful reproduction in a population?

Adaptation Signup and view all the answers

Which term describes a chronic response of an individual to a changed environment?

Acclimatization Signup and view all the answers

What is the measure of enzyme-substrate affinity used in the HCA method?

Enzyme-substrate affinity (≈1/Km) Signup and view all the answers

Which of the following best describes temperature?

A measure of the speed or intensity of the incessant random motions that all the atoms and molecules of any substance undergo on an atomic-molecular scale Signup and view all the answers

What determines the direction of heat transfer?

Temperature Signup and view all the answers

Which of the following best describes heat?

The amount of energy in an object Signup and view all the answers

What is the formula for latent heat of vaporisation of water?

$2270 kJ/kg$ Signup and view all the answers

Which of the following best describes ectotherms?

Organisms that rely mostly on external temperatures to determine body temperature Signup and view all the answers

What is the term for having different body temperatures in different parts of the body?

Heterothermy Signup and view all the answers

Which of the following best describes endotherms?

Organisms that generate internal (metabolic) heat Signup and view all the answers

What is the term for organisms that allow their body temperature to vary?

Poikilotherms Signup and view all the answers

What is the term for organisms that keep their body temperature constant?

Homeotherms Signup and view all the answers

What is the term for organisms that have more than one temperature set point or switch between homeothermy and poikilothermy?

Heterotherms Signup and view all the answers